Abstract
The presence of triiodide, I3–, throughout the lifetime of a persulfate–iodide reaction with persulfate in excess, is controlled by an opposing effect of falling iodide concentration and rising iodine concentration. This brings triiodide to a concentration maximum, [I3–]max, which can be studied by UV–visible spectroscopy using absorbance measurements taken over an extended iodine clock time-scan. Equilibrium and conservation equations can be combined so that, together with [I3–]max, a value of the constant K for the equilibrium established between iodine, iodide, and the triiodide complex ion can be obtained.
Original language | English |
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Pages (from-to) | 814–816 |
Number of pages | 3 |
Journal | Journal of Chemical Education |
Volume | 89 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2012 |
Externally published | Yes |